Delegation is a pattern that is commonly applied in software engineering. The primary objective is to leverage the capabilities of an existing component by wrapping it via a has-a relationship.
The delegation pattern is widely adopted, even in the object-oriented programming community. In the early days of object-oriented programming, people thought that code reuse could be achieved beautifully using inheritance. However, people came to realize that this promise couldn't be completely fulfilled due to a variety of issues related to inheritance. Since then, many software engineers prefer composition over inheritance. The concept of composition is to wrap one object within another. In order to reuse existing functions, we must delegate functions calls to the wrapped object. This section will explain how delegation can be implemented in Julia.
The...